1
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Pérez AL, Kemmerer A, Zapata AJ, Sartoris R, Gonzalez PJ, Urteaga R, Baggio R, Suarez S, Ramos CA, Dalosto SD, Rizzi AC, Brondino CD. Synthesis, structure, and characterisation of a ferromagnetically coupled dinuclear complex containing Co(II) ions in a high spin configuration and thiodiacetate and phenanthroline as ligands and of a series of isomorphous heterodinuclear complexes containing different Co : Zn ratios. Dalton Trans 2023; 52:14595-14605. [PMID: 37786344 DOI: 10.1039/d3dt02115g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
We report the synthesis, crystal structure, and characterisation of a dinuclear Co(II) compound with thiodiacetate (tda) and phenanthroline (phen) as ligands (1), and of a series of metal complexes isomorphous to 1 with different Co : Zn ratios (2, 4 : 1; 3, 1 : 1; 4, 1 : 4; 5, 1 : 10). General characterisation methodologies and X-ray data showed that all the synthesised complexes are isomorphous to Zn(II) and Cu(II) analogues (CSD codes: DUHXEL and BEBQII). 1 consists of centrosymmetric Co(II) ion dimers in which the ions are 3.214 Å apart, linked by two μ-O bridges. Each cobalt atom is in a distorted octahedral environment of the N2O3S type. UV-vis spectra of 1 and 5 are in line with high spin (S = 3/2) Co(II) ions in octahedral coordination and indicate that the electronic structure of both Co(II) ions in the dinuclear unit does not significantly change relative to that of the magnetically isolated Co(II) ion. EPR spectra of powder samples of 5 (Co : Zn ratio of 1 : 10) together with spectral simulation indicated high spin Co(II) ions with high rhombic distortion of the zfs [E/D = 0.31(1), D > 0]. DC magnetic susceptibility experiments on 1 and analysis of the data constraining the E/D value obtained by EPR yielded g = 2.595(7), |D| = 61(1) cm-1, and an intradimer ferromagnetic exchange coupling of J = 1.39(4) cm-1. EPR spectra as a function of Co : Zn ratio for both powder and single crystal samples confirmed that they result from two effective S' = 1/2 spins that interact through dipolar and isotropic exchange interactions to yield magnetically isolated S' = 1 centres and that interdimeric exchange interactions, putatively mediated by hydrophobic interactions between phen moieties, are negligible. The latter observation contrasts with that observed in the Cu(II) analogue, where a transition from S = 1 to S' = 1/2 was observed. Computational calculations indicated that the absence of the interdimeric exchange interaction in 1 is due to a lower Co(II) ion spin density delocalisation towards the metal ligands.
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Affiliation(s)
- Ana L Pérez
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
- Instituto de Física del Litoral, Universidad Nacional del Litoral - CONICET, Güemes 3450, 3000 Santa Fe, Argentina
| | - Axel Kemmerer
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
| | - Alejandro J Zapata
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
| | - Rosana Sartoris
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
| | - Pablo J Gonzalez
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
| | - Raul Urteaga
- Instituto de Física del Litoral, Universidad Nacional del Litoral - CONICET, Güemes 3450, 3000 Santa Fe, Argentina
- Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, 3000 Santa Fe, Argentina
| | - Ricardo Baggio
- Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
| | - Sebastián Suarez
- Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
| | - Carlos A Ramos
- Instituto de Nanociencia y Nanotecnología, CNEA-CONICET, Centro Atómico Bariloche, 8400, San Carlos de Bariloche, Río Negro, Argentina
| | - Sergio D Dalosto
- Instituto de Física del Litoral, Universidad Nacional del Litoral - CONICET, Güemes 3450, 3000 Santa Fe, Argentina
- Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, 3000 Santa Fe, Argentina
| | - Alberto C Rizzi
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
| | - Carlos D Brondino
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
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2
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Nößler M, Neuman NI, Böser L, Jäger R, Singha Hazari A, Hunger D, Pan Y, Lücke C, Bens T, van Slageren J, Sarkar B. Spin Crossover and Fluorine-Specific Interactions in Metal Complexes of Terpyridines with Polyfluorocarbon Tails. Chemistry 2023; 29:e202301246. [PMID: 37191067 DOI: 10.1002/chem.202301246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/15/2023] [Accepted: 05/16/2023] [Indexed: 05/17/2023]
Abstract
In coordination chemistry and materials science, terpyridine ligands are of great interest, due to their ability to form stable complexes with a broad range of transition metal ions. We report three terpyridine ligands containing different perfluorocarbon (PFC) tails on the backbone and the corresponding FeII and CoII complexes. The CoII complexes display spin crossover close to ambient temperature, and the nature of this spin transition is influenced by the length of the PFC tail on the ligand backbone. The electrochemical properties of the metal complexes were investigated with cyclic voltammetry revealing one oxidation and several reduction processes. The fluorine-specific interactions were investigated by EPR measurements. Analysis of the EPR spectra of the complexes as microcrystalline powders and in solution reveals exchange-narrowed spectra without resolved hyperfine splittings arising from the 59 Co nucleus; this suggests complex aggregation in solution mediated by interactions of the PFC tails. Interestingly, addition of perfluoro-octanol in different ratios to the acetonitrile solution of the sample resulted in the disruption of the F ⋯ ${\cdots }$ F interactions of the tails. To the best of our knowledge, this is the first investigation of fluorine-specific interactions in metal complexes through EPR spectroscopy, as exemplified by exchange narrowing.
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Affiliation(s)
- Maite Nößler
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
| | - Nicolás I Neuman
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
- Instituto de Desarrollo Tecnológico para la Industria Química, INTEC, UNL-CONICET Predio CCT Conicet "Dr. Alberto Cassano", Colectora RN 168, Km 0, Paraje El Pozo, 3000, Santa Fe, Argentina
| | - Lisa Böser
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
| | - René Jäger
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
| | - Arijit Singha Hazari
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - David Hunger
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Yixian Pan
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Clemens Lücke
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Tobias Bens
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Joris van Slageren
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
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3
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Calvo R, Sartoris RP, Nascimento OR, Šedivý M, Sojka A, Neugebauer P, Santana VT. Quantum phase transitions probed by EPR spectra in dimeric spin arrays with supramolecular couplings. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.215007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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4
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Suryadevara N, Boudalis AK, Olivares Peña JE, Moreno-Pineda E, Fediai A, Wenzel W, Turek P, Ruben M. Molecular-Engineered Biradicals Based on the Y III-Phthalocyanine Platform. J Am Chem Soc 2023; 145:2461-2472. [PMID: 36656167 DOI: 10.1021/jacs.2c11760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A mixed-ligand phthalocyanine/porphyrin yttrium(III) radical double-decker complex (DD) was synthesized using the custom-made 5,10,15-tris(4-methoxyphenyl)-20-(4-((trimethylsilyl)ethynyl)phenyl)porphyrin. The trimethylsilyl functionality was then used to couple two such complexes into biradicals through rigid tethers. Glaser coupling was used to synthesize a short-tethered biradical (C1) and Sonogashira coupling to synthesize longer-tethered ones (C2 and C3). Field-swept echo-detected (FSED), saturation recovery, and spin nutation-pulsed electron paramagnetic resonance experiments revealed marked similarities of the magnetic properties of DD with those of the parent [Y(pc)2]• complex, both in the solid state and in CD2Cl2/CDCl3 4:1 frozen glasses. FSED experiments on the biradicals C2 and C3 revealed a spectral broadening with respect to the spectra of DD and [Y(pc)2]• assigned to the effect of dipolar interactions in solution. Apart from the main resonance, satellite features were also observed, which were simulated with dipole-dipole pairs of shortest distances, suggesting spin delocalization on the organic tether. FSED experiments on C1 yielded spectral line shapes that could not be simulated as the integration of the off-resonance echoes was complicated by field-dependent modulations. While, for all dimers, the on-resonance spin nutation experiments yielded Rabi oscillations of the same frequencies, off-resonance nutations on C1 yielded Rabi oscillations that could be assigned to a MS = -1 to MS = 0 transition within a S = 1 multiplet. The DFT calculations showed that the trans conformation of the complexes was significantly more stable than the cis one and that it induced a marked spin delocalization over the rigid organic tether. This "spin leakage" was most pronounced for the shortest biradical C1.
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Affiliation(s)
- Nithin Suryadevara
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Eggenstein-LeopoldshafenD-76344, Germany.,Institute for Quantum Materials and Technology (IQMT), Karlsruhe Institute of Technology (KIT), Eggenstein-LeopoldshafenD-76344, Germany
| | - Athanassios K Boudalis
- Institute for Quantum Materials and Technology (IQMT), Karlsruhe Institute of Technology (KIT), Eggenstein-LeopoldshafenD-76344, Germany.,Institut de Science et d'Ingénierie Suparamolaiculaires─ISIS, 8 allée Gaspard Monge, BP 70028, Strasbourg CedexF-67083, France.,Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra), Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, StrasbourgF-67081, France
| | - Jorge Enrique Olivares Peña
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Eggenstein-LeopoldshafenD-76344, Germany
| | - Eufemio Moreno-Pineda
- Departamento de Química-Física, Facultad de Ciencias Naturales, Exactas y Tecnología, Universidad de Panamá, Panama0824, Panama
| | - Artem Fediai
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Eggenstein-LeopoldshafenD-76344, Germany
| | - Wolfgang Wenzel
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Eggenstein-LeopoldshafenD-76344, Germany
| | - Philippe Turek
- Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra), Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, StrasbourgF-67081, France
| | - Mario Ruben
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Eggenstein-LeopoldshafenD-76344, Germany.,Institute for Quantum Materials and Technology (IQMT), Karlsruhe Institute of Technology (KIT), Eggenstein-LeopoldshafenD-76344, Germany.,Institut de Science et d'Ingénierie Suparamolaiculaires─ISIS, 8 allée Gaspard Monge, BP 70028, Strasbourg CedexF-67083, France
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5
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Chandra S, Hazari AS, Song Q, Hunger D, Neuman NI, van Slageren J, Klemm E, Sarkar B. Remarkable Enhancement of Catalytic Activity of Cu-Complexes in the Electrochemical Hydrogen Evolution Reaction by Using Triply Fused Porphyrin. CHEMSUSCHEM 2023; 16:e202201146. [PMID: 36173981 PMCID: PMC10107348 DOI: 10.1002/cssc.202201146] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 08/22/2022] [Indexed: 06/16/2023]
Abstract
A bimetallic triply fused copper(II) porphyrin complex (1) was prepared, comprising two monomeric porphyrin units linked through β-β, meso-meso, β'-β' triple covalent linkages and exhibiting remarkable catalytic activity for the electrochemical hydrogen evolution reaction in comparison to the analogous monomeric copper(II) porphyrin complex (2). Electrochemical investigations in the presence of a proton source (trifluoroacetic acid) confirmed that the catalytic activity of the fused metalloporphyrin occurred at a significantly lower overpotential (≈320 mV) compared to the non-fused monomer. Controlled potential electrolysis combined with kinetic analysis of catalysts 1 and 2 confirmed production of hydrogen, with 96 and 71 % faradaic efficiencies and turnover numbers of 102 and 18, respectively, with an observed rate constant of around 107 s-1 for the dicopper complex. The results thus firmly establish triply fused porphyrin ligands as outstanding candidates for generating highly stable and efficient molecular electrocatalysts in combination with earth-abundant 3d transition metals.
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Affiliation(s)
- Shubhadeep Chandra
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - Arijit Singha Hazari
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - Qian Song
- Institut für Technische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - David Hunger
- Institut für Physikalische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - Nicolás. I. Neuman
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
- Instituto de Desarrollo Tecnológico para la Industria Química CCTINTEC, UNL-CONICETPredio CONICET Santa Fe Dr. Alberto CassanoRuta Nacional N° 168, Km 0, Paraje El PozoS3000ZAASanta FeArgentina
| | - Joris van Slageren
- Institut für Physikalische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - Elias Klemm
- Institut für Technische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - Biprajit Sarkar
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
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6
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Stubbe J, Neuman NI, McLellan R, Sommer MG, Nößler M, Beerhues J, Mulvey RE, Sarkar B. Isomerization Reactions in Anionic Mesoionic Carbene-Borates and Control of Properties and Reactivities in the Resulting Co II Complexes through Agostic Interactions. Angew Chem Int Ed Engl 2021; 60:499-506. [PMID: 33080102 PMCID: PMC7839553 DOI: 10.1002/anie.202013376] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Indexed: 12/31/2022]
Abstract
We present herein anionic borate-based bi-mesoionic carbene compounds of the 1,2,3-triazol-4-ylidene type that undergo C-N isomerization reactions. The isomerized compounds are excellent ligands for CoII centers. Strong agostic interactions with the "C-H"-groups of the cyclohexyl substituents result in an unusual low-spin square planar CoII complex, which is unreactive towards external substrates. Such agostic interactions are absent in the complex with phenyl substituents on the borate backbone. This complex displays a high-spin tetrahedral CoII center, which is reactive towards external substrates including dioxygen. To the best of our knowledge, this is also the first investigation of agostic interactions through single-crystal EPR spectroscopy. We conclusively show here that the structure and properties of these CoII complexes can be strongly influenced through interactions in the secondary coordination sphere. Additionally, we unravel a unique ligand rearrangement for these classes of anionic mesoionic carbene-based ligands.
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Affiliation(s)
- Jessica Stubbe
- Institut für Chemie und BiochemieAnorganische ChemieFreie Universität BerlinFabeckstrasse 34–3614195BerlinGermany
| | - Nicolás I. Neuman
- Institut für Chemie und BiochemieAnorganische ChemieFreie Universität BerlinFabeckstrasse 34–3614195BerlinGermany
- Instituto de Desarrollo Tecnológico para la Industria Química CCT Santa Fe CONICET-UNLColectora Ruta Nacional 168, Km 472, Paraje El Pozo3000Santa FeArgentina
| | - Ross McLellan
- WestCHEMDepartment of Pure & Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
| | - Michael G. Sommer
- Institut für Chemie und BiochemieAnorganische ChemieFreie Universität BerlinFabeckstrasse 34–3614195BerlinGermany
| | - Maite Nößler
- Institut für Chemie und BiochemieAnorganische ChemieFreie Universität BerlinFabeckstrasse 34–3614195BerlinGermany
| | - Julia Beerhues
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - Robert E. Mulvey
- WestCHEMDepartment of Pure & Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
| | - Biprajit Sarkar
- Institut für Chemie und BiochemieAnorganische ChemieFreie Universität BerlinFabeckstrasse 34–3614195BerlinGermany
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
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7
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Stubbe J, Neuman NI, McLellan R, Sommer MG, Nößler M, Beerhues J, Mulvey RE, Sarkar B. Isomerisierungsreaktionen in anionischen mesoionischen Carbenboraten und Kontrolle der Eigenschaften und Reaktivität in den entstehenden Co
II
‐Komplexen durch agostische Wechselwirkungen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202013376] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jessica Stubbe
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstraße 34–36 14195 Berlin Deutschland
| | - Nicolás I. Neuman
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstraße 34–36 14195 Berlin Deutschland
- Instituto de Desarrollo Tecnológico para la Industria Química CCT Santa Fe CONICET-UNL Colectora Ruta Nacional 168, Km 472, Paraje El Pozo 3000 Santa Fe Argentinien
| | - Ross McLellan
- WestCHEM Department of Pure & Applied Chemistry University of Strathclyde Glasgow G1 1XL Großbritannien
| | - Michael G. Sommer
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstraße 34–36 14195 Berlin Deutschland
| | - Maite Nößler
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstraße 34–36 14195 Berlin Deutschland
| | - Julia Beerhues
- Lehrstuhl für Anorganische Koordinationschemie Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Robert E. Mulvey
- WestCHEM Department of Pure & Applied Chemistry University of Strathclyde Glasgow G1 1XL Großbritannien
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstraße 34–36 14195 Berlin Deutschland
- Lehrstuhl für Anorganische Koordinationschemie Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Deutschland
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8
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Pérez AL, Kemmerer A, Rey MA, Dalosto SD, Ramos CA, Passeggi MCG, Rizzi AC, Brondino CD. Coupled High Spin Co
II
Ions Linked by Symmetrical Double Hydrogen Bonds: Role of a Slowly Relaxing Cu
II
Impurity in Interrupting the Co
II
–Co
II
Exchange Interaction. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800593] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ana L. Pérez
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
| | - Axel Kemmerer
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
| | - Marilin A. Rey
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
| | - Sergio D. Dalosto
- Instituto de Física del Litoral Universidad Nacional del Litoral ‐ CONICET Güemes 3450 3000 Santa Fe Argentina
| | - Carlos A. Ramos
- Centro Atómico Bariloche Comisión Nacional de Energía Atómica Av. Bustillo 9500 8400 Bariloche Río Negro Argentina
| | - Mario C. G. Passeggi
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
- Instituto de Física del Litoral Universidad Nacional del Litoral ‐ CONICET Güemes 3450 3000 Santa Fe Argentina
| | - Alberto C. Rizzi
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
| | - Carlos D. Brondino
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
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9
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Neuman NI. Effective Anisotropic Interactions in Spin Pairs Containing High-Spin Ions with Large Zero-Field Splitting. J Phys Chem A 2018; 122:234-238. [PMID: 29235864 DOI: 10.1021/acs.jpca.7b11908] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Analytic and numeric derivations are made of the effective exchange and dipolar magnetic interactions between spin pairs containing S = 3/2 ions, such as high-spin Co(II), S = 5/2 ions, such as high-spin Fe(III) ions, experiencing zero-field splittings much larger than the interion interactions, or J = 15/2 ions such as Dy(III) with crystal-field splittings much larger than the interion interaction. These formulas allow for a simpler analysis of the magnetic properties of dimers containing high-spin ions.
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Affiliation(s)
- Nicolás I Neuman
- Departamento de Física, FBCB-UNL, CONICET, Facultad de Bioquímica y Ciencias Biológicas, Ciudad Universitaria , Ruta N 168 S/N, S3000ZAA Santa Fe, Argentina
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10
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Berezin AS, Krisyuk VV, Nadolinny VA, Baidina IA, Romanenko GV, Korotaev EV. Synthesis, structure, and magnetic properties of the tetranuclear complex [Cu(tmhd) 2Pb(hfa) 2] 2. Influence of temperature-dependent rotation of CF 3 groups upon EPR spectra. J COORD CHEM 2017. [DOI: 10.1080/00958972.2017.1393070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Alexey S. Berezin
- Nikolaev Institute of Inorganic Chemistry Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation
| | - Vladislav V. Krisyuk
- Nikolaev Institute of Inorganic Chemistry Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation
| | - Vladimir A. Nadolinny
- Nikolaev Institute of Inorganic Chemistry Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation
| | - Iraida A. Baidina
- Nikolaev Institute of Inorganic Chemistry Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation
| | - Galina V. Romanenko
- International Tomography Center Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation
| | - Evgeniy V. Korotaev
- Nikolaev Institute of Inorganic Chemistry Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation
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11
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Žilić D, Maity D, Cetina M, Molčanov K, Džolić Z, Herak M. Magnetostructural Characterization of Oxalamide Dihalo-Bridged Copper Dimers: Intra- and Interdimer Interactions Studied by Single-Crystal Electron Spin Resonance Spectroscopy. Chemphyschem 2017. [PMID: 28636148 DOI: 10.1002/cphc.201700433] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Detailed single-crystal electron spin resonance (ESR) analysis of oxalamide complexes with halogen-bridged copper dimers, supported by X-ray, magnetic susceptibility, and powder ESR studies, is reported. Four complexes with two different ligands are synthesized: [CuLA (μ-X)]2 and [CuLV (μ-X)]2 , for which LA =N-(l-alanine methyl ester)-N'-[(2-pyridine-2-yl)methyl]oxalamide and LV =N-(l-valine methyl ester)-N'-[(2-pyridine-2-yl)methyl]oxalamide, for which X=Cl or Br. X-ray analysis shows that the geometry at each copper(II) ion is square pyramidal, whereas two pyramids share one base-to-apex edge with parallel basal planes. The complexes are linked by hydrogen bonds into infinite chains and are further linked into a 3D network. Susceptibility measurements show that the copper centers in the dimers are weakly antiferromagnetically coupled (|J|≈1-2 cm-1 ). From powder ESR spectroscopy, the g values and dx2-y2 orbital as the ground state of the unpaired electron are determined. The complexes show unusual anisotropic splitting and merging of the ESR lines if their single crystals rotate in a magnetic field. The observation of this partially resolved intradimer dipolar splitting enables estimation of the weak interdimer exchange interaction parameter |J'|≈0.001 cm-1 .
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Affiliation(s)
- Dijana Žilić
- Ruđer Bošković Institute, Bijenička c. 54, HR-10000, Croatia
| | - Debdeep Maity
- Ruđer Bošković Institute, Bijenička c. 54, HR-10000, Croatia
| | - Mario Cetina
- Department of Applied Chemistry, Faculty of Textile Technology, University of Zagreb, Prilaz baruna Filipovića 28a, HR-10000, Zagreb, Croatia
| | | | - Zoran Džolić
- Ruđer Bošković Institute, Bijenička c. 54, HR-10000, Croatia
| | - Mirta Herak
- Institute of Physics, Bijenička c. 46, HR-10000, Zagreb, Croatia
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Trzebiatowska-Gusowska M, Gągor A. The order-disorder state of diaminoalkanes in Cu-based metal-organic materials. J COORD CHEM 2017. [DOI: 10.1080/00958972.2017.1305109] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
| | - Anna Gągor
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland
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13
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Exchange interaction between S= 1/2 centers bridged by multiple noncovalent interactions: Contribution of the individual chemical pathways to the magnetic coupling. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.12.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Rizzi AC, Neuman NI, González PJ, Brondino CD. EPR as a Tool for Study of Isolated and Coupled Paramagnetic Centers in Coordination Compounds and Macromolecules of Biological Interest. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201501111] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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